Absolutely, those are great ideas, we definitely need more apps tackling these problems.

Wallet fingerprinting is a big goal of chain analyze so having more privacy related standardization in wallets to protect against that would be super helpful.

I plan on trying to add a "Transaction Privacy Analyzer" to Live Wallet to help highlight the potential privacy issues in a bitcoin transaction, hopefully catching some of these errors before the transaction is broadcast. I noted about it recently here

https://primal.net/e/note1xe2vq6sz83htekmt07f3j039vg2g6lp7pn0z0sjn6u9w3lg0628qvkz2sr